export const guid = ()=>{
    let s = [];

    let hexDigits = '0123456789abcdef';

    for (let i = 0; i < 36; i++) {

        s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1);

    }
    s[14] = '4';

    s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1);

    s[8] = s[13] = s[18] = s[23] = '-';

    let uuid = s.join('');

    return uuid;

};